Josh is in charge of creating the design specifics for the building envelope of a series of homes that will be built in a new subdivision. He has been tasked to find ways to make the envelope more sustainable and energy efficient. First, choose three of the layers of the building envelope:(1) roof; (2) cladding; (3) fenestration; (4) drainage and waterproofing; (5) air barrier; (6) vapor barrier; and (7) insulation. Next, describe what materials and practices Josh could recommend to help improve the sustainability and energy efficiency of that layer. Remember to address both sustainability and energy efficiency.